Physics2DNamespace: UnityEngine

AllLayers	Layer mask constant that includes all layers.
DefaultRaycastLayers	Layer mask constant that includes all layers participating in raycasts by default.
gravity	Acceleration due to gravity.
IgnoreRaycastLayer	Layer mask constant for the default layer that ignores raycasts.
positionIterations	The number of iterations of the physics solver when considering objects' positions.
raycastsHitTriggers	Do raycasts detect Colliders configured as triggers?
velocityIterations	The number of iterations of the physics solver when considering objects' velocities.

GetIgnoreLayerCollision	Should collisions between the specified layers be ignored?
GetRayIntersection	Cast a 3D ray against the colliders in the scene returning the first collider along the ray.
GetRayIntersectionAll	Cast a 3D ray against the colliders in the scene returning all the colliders along the ray.
GetRayIntersectionNonAlloc	Cast a 3D ray against the colliders in the scene returning the colliders along the ray.
IgnoreLayerCollision	Choose whether to detect or ignore collisions between a specified pair of layers.
Linecast	Casts a line against colliders in the scene.
LinecastAll	Casts a line against colliders in the scene.
LinecastNonAlloc	Casts a line against colliders in the scene.
OverlapArea	Check if a collider falls within a rectangular area.
OverlapAreaAll	Get a list of all colliders that fall within a rectangular area.
OverlapAreaNonAlloc	Get a list of all colliders that fall within a specified area.
OverlapCircle	Check if a collider falls within a circular area.
OverlapCircleAll	Get a list of all colliders that fall within a circular area.
OverlapCircleNonAlloc	Get a list of all colliders that fall within a circular area.
OverlapPoint	Check if a collider overlaps a point in space.
OverlapPointAll	Get a list of all colliders that overlap a point in space.
OverlapPointNonAlloc	Get a list of all colliders that overlap a point in space.
Raycast	Casts a ray against colliders in the scene.
RaycastAll	Casts a ray against colliders in the scene, returning all colliders that contact with it.
RaycastNonAlloc	Casts a ray into the scene.